Singer-guitarist Bob Weir, on tour with the Grateful Dead offshoot band Furthur, collapsed on stage at the Capitol Theatre in Port Chester, N.Y., Thursday night and was unable to finish the show, the finale of a nine-concert residency at the venue.

The 65-year-old Weir, a longtime resident of Mill Valley, was leaning to his left before finally toppling over, crumpling to the floor as bassist Phil Lesh sang “Unbroken Chain” during the band’s second set.

Crew members helped him to his feet and began to lead him into the wings, but Weir apparently talked them into allowing him to finish the song. He kept playing his guitar while sitting on a chair. When the song was over, the band left the stage, returning a few minutes later without Weir, a member of the Rock and Roll Hall of Fame.

Lesh told the crowd Weir was suffering from a strained shoulder, and the band continued the concert without him. Reached Friday morning, Weir’s manager Matt Busch declined comment on his client’s condition and would not say whether Furthur would play Atlantic City’s Boardwalk Hall on Saturday as scheduled.

During the show, it was announced that the theater’s lobby bar would be named after Weir’s Grateful Dead bandmate, the late Jerry Garcia.